errors.go

package errors

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"

	"github.com/micro/go-micro/errors"
)

func unwrap(merr *errors.Error) *errors.Error {
	var derr *errors.Error
	if err := json.Unmarshal([]byte(merr.Detail), &derr); err != nil {
		return merr
	}
	return unwrap(derr)
}

func WriteJson(w http.ResponseWriter, merr error) error {
	var err error
	var rsp *errors.Error

	w.Header().Set("Content-Type", "application/json")
	switch v := merr.(type) {
	case *errors.Error:
		rsp = unwrap(merr.(*errors.Error))
	default:
		//		fmt.Printf("%T %#+v\n", merr, merr)
		err = json.Unmarshal([]byte(merr.Error()), &rsp)
		if err != nil {
			rsp = &errors.Error{
				Id:     "org.unistack.api",
				Code:   http.StatusInternalServerError,
				Detail: fmt.Sprintf("%v", v),
				Status: http.StatusText(http.StatusInternalServerError),
			}
		}
	}

	w.WriteHeader(int(rsp.Code))
	_, err = w.Write([]byte(rsp.Error()))
	log.Println(rsp.Error())
	return err
}